PAVER-MOUNTED THERMAL PROFILES
406.1 Description. This work shall consist of continuous thermal profiling of the asphalt mat temperature
behind the trailing edge of the paver screed plate during placement operations using a Paver-Mounted Thermal Profile System (PMTPS). This work shall be completed in accordance with the general principles set forth in AASHTO R 110 “Standard Practice for Continuous Thermal Profile of Asphalt Mixture Construction”, and specifically as stated in the following sections.
406.2 Required Measurements. PMTPS measurements are required on the full width of paving of each asphalt
lift required by Sec 403. Collection of data shall include shoulder pavement when placed simultaneously with the mainline. The shoulder paving data will be filtered out using Veta during data processing. PMTPS data collection is not required in the following exceptions:
a.PMTPS measurements are not required on auxiliary lane tapers, ramps, shoulders (not paved simultaneously with mainline), cross-overs, non-continuous turn lanes, loops, bypass lanes, acceleration/deceleration lanes, intersecting streets, roundabouts, and partial lane width widenings.
b.PMTPS measurements are not required for a total net paving length less than 2 lane miles.
c.PMTPS measurements are not required on asphalt lift thicknesses less than 1 inch.
406.3 Equipment Requirements. The PMTPS shall consist of the following components listed.
a.Temperature sensor to continuously monitor surface temperature of mat.
1.Longitudinal and lateral surface temperature readings shall be collected at 12-inch or less intervals at all paving speeds with an X-Y accuracy of plus or minus 1 inch.
2.Surface temperatures shall be collected for the full width paved in one pass (including any shoulders paved simultaneously with mainline).
3.Surface temperature sensors(s) shall have a temperature range of at least 140 F to 480 F. Sensory accuracy shall be plus or minus 3.6 F, or plus or minus 2.0 percent of sensor reading, whichever is greater.
b.Global Navigation Satellite System (GNSS) receiver to capture coordinates of the surface temperature readings. GNSS accuracy shall be plus or minus 2 inches or less in X and Y directions when intelligent compaction is being used. A base station shall be required at any locations having poor cellular reception to obtain required accuracy. When intelligent compaction is not being used GNSS accuracy shall be plus or minus 4 feet or less in the X and Y directions and ground distance sensor shall be within plus or minus 1/1000 feet.
c.Onboard data acquisition with a minimum of the following capabilities:
1.Displays (in real-time) map of the surface temperature readings.
2.Displays total distance, paver speed and location.
3.Reports surface temperature readings and GNSS status.
4.Provides real-time statistical summaries of surface temperature readings.
5.Allows operator to define data lot currently being placed per AASHTO PP 114.
6.Stores data internally until data transfer.
7.Automatically transfers data to cloud storage or other approved methods.
406.3.1 System Setup on Pavers. Pavers shall be instrumented with the PMTP system for the full paving width
and shall collect measurements no less than 3 feet and no greater than 12 feet from the trailing edge of the screed plate. Other objects shall not obstruct surface temperature measurements and GNSS accuracy.
406.4 Construction Requirements.
406.4.1 Temperature Verification. Temperature verification shall follow AASHTO R110-22, Section 6
Calibration. A record of each verification shall be submitted to the SharePoint site prior to the start of the project.
406.4.2 Data Management. PMTP data files shall be compatible with the Veta software. The contractor shall
supply the engineer with the manufacturer’s PMTPS Computer Software 14 days prior to beginning work and until ninety days after completion of all work. If Cloud Storage or Cloud Computing is used, the engineer shall be supplied one user ID with full access for the same time-period specified. If cloud storage is not used Raw PMTP data files shall be downloaded once per day and uploaded to the appropriate MoDOT IC-PMTP SharePoint site before the start of the next day’s production. The following data management requirements shall apply:
a.The PMTP data files should be directly transferred from cloud storage to Veta. Other methods shall be approved by the engineer.
b.The PMTP Veta files shall be appropriately formatted and filtered in accordance with MoDOT IC- PMTP protocol.
c.Date and time stamp of PMTP shall be checked and verified to reflect the local time zone for both mapped and exported data.
406.4.3 Quality Control. The following shall apply to the Contractor’s Quality Control for PMTP.
a.The contractor shall have a properly trained person listed in the QC Plan that has completed a Veta training course within the last 2 years to perform the PMTP data collection and file management for the project.
b.The PMTP system shall have a documented annual calibration before beginning construction.
c.For each run, the thermal profile shall be divided into 150-foot sublots at the full paving width and partial data sublots as follows:
1.Combine partial data sublots less than 75 feet with the previous data sublot.
2.Treat partial sublots greater than 75 feet as one data sublot.
3.Sublots shall not extend over multiple days, different lifts, or paving directions.
d.Veta files shall be completed and uploaded with the appropriate naming convention in accordance with MoDOT IC-PMTPS Protocol. Appropriate naming convention can be found in the IC-PMTP Document Helper. The completed Veta files shall have the appropriate filters applied with the summary data transferred to the Summary Report. An up-to-date Summary Report shall be provided to the engineer two days prior to the 1st and 15th of each month.
e.PMTP Quality Control Plan. A pre-activity meeting shall be required prior to mainline paving. The PMTP Quality Control Plan shall be submitted to the engineer at least 2 weeks prior to the mainline paving pre-activity meeting. The plan at minimum shall include the following:
1.A list of personnel previously trained
2.Detailed daily verification procedure for checking the RTK-GNSS of PMTP
3.Procedure for downloading PMTP data from the instrument
4.The procedure for training operators or other project staff
5.Detailed daily verification procedure for checking the temperature sensor on the PMTP
6.The name of the designated PMTP Quality Control Technician
7.Procedure for submitting data
8.Contact information for technical support staff
9.Anticipated cellular service and GNSS coverage throughout entire project
10.A list of the control points with either UTM or State Plane Coordinates established by the contactor if a base station is required.
406.4.4 Quality Assurance (QA) Testing. The engineer will use a Forward Looking InfraRed (FLIR) camera to
verify the contractor’s PMTP system. QA tests shall be taken at random locations twice per day. The contractor shall assist the engineer with the placement of the event marker. The QA tests using the FLIR data QA tool shall compare favorably, according to the instructions found in the IC-PMTP Document Helper. If results do not compare favorably, the contractor’s PMTPS shall be verified by the manufacturer. In the case that the PMTPS is required to be sent off to the manufacturer and the contractor is not able to provide a replacement, the contractor will be allowed to continue paving with the verification by the engineer using a FLIR camera for acceptance only.
406.4.5 Thermal Segregation. Thermal segregation will be calculated by using the Differential Range Statistics
(DRS) under the parameters of AASHTO R110 in each 150-foot sublot. The Veta analysis with the appropriate filters applied shall exclude the following surface temperature readings from each sublot:
a.Surface temperature readings less than 180 F.
b.Surface temperature readings within 2 feet. prior to and 8 feet. after paver stops that are greater than 1 minute in length. The thermal segregation categories are based on the Differential Range Statistics (DRS), as shown in the table below. Differential Range Statistics (DRS)Thermal Segregation Category DRS ≤ 25.0°F Low 25°F < DRS ≤ 35°F Moderate 35°F < DRS ≤ 50°F Moderate-High DRS ≥ 50°F Severe
406.4.6 Incentive/Disincentive. Incentive/disincentive adjustments shall be made for each sublot in accordance
with the following: Thermal Segregation Category Adjustment per 150 ft. Sublot Low $40 Incentive Moderate $40 to $0 Incentive (Linear) Moderate-High $0 to -$40 Disincentive (Linear) Severe -$40 Disincentive and Reviewed by Engineer
406.5 Loss of Data. If data collection ceases as a result of circumstances reasonably beyond the control of the
contractor, the contractor will be allowed to continue the days paving, but the paved sublots will not be eligible for 406 PMTP Incentive. The engineer must be notified immediately of the issue and shall determine if the contractor has made a reasonable effort to resolve the issue. A meeting with the engineer shall be held to determine how to proceed if the issue is expected to extend into the next day’s paving. Failure to notify the engineer of the issue at hand will result in the paved sublots to receive a minus $40 deduct.
406.5.1 GNSS Obstructions. Isolated areas of GNSS obstruction may be filtered out of Veta at the contractor’s
choice. These areas shall be identified in Veta and brought to the attention of the engineer. Areas excluded from GPS obstruction shall not exceed approximately 5 percent of the total day’s production. It is at the discretion of the engineer to determine if the area exceeds an approximate 5 percent.
406.6 Basis of Payment. No direct payment will be made for compliance with this provision.
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Source: Missouri Standard Specifications for Highway Construction, 2026 (Oct) Edition. Pages 213–216 of 874. View official source ↗